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Coatings 2014, 4(1), 85-97; doi:10.3390/coatings4010085

Spray-on PEDOT:PSS and P3HT:PCBM Thin Films for Polymer Solar Cells

School of Engineering and Computing Sciences, Texas A&M University-Corpus Christi, Corpus Christi, TX 78412, USA
Present address: University of Michigan-Shanghai Jiao Tong University Joint Institute, Shanghai 200240, China.
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Received: 6 December 2013 / Revised: 31 December 2013 / Accepted: 8 January 2014 / Published: 21 January 2014
(This article belongs to the Special Issue Novel Thin Film Materials for Photovoltaic Applications)
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Abstract

PEDOT:PSS electron-blocking layer, and PEDOT:PSS + P3HT:PCBM stacked layers are fabricated by ultrasonic atomization and characterized by scanning electron microscopy (SEM) and optical profilometry. The measured thicknesses based on SEM and optical profilometry are quite different, indicating the incapability of measurement techniques for non-uniform thin films. The thickness measurements are compared against theoretical estimations and a qualitative agreement is observed. Results indicate that using a multiple pass fabrication strategy results in a more uniform thin film. It was also found that the film characteristics are a strong function of solution concentration and spraying passes, and a weak function of substrate speed. Film thickness increases with solution concentration but despite the prediction of theory, the increase is not linear, indicating a change in the film porosity and density, which can affect physical and opto-electrical properties. Overall, while spray coating is a viable fabrication process for a wide range of solar cells, film characteristics can be easily altered by a change in process parameters.
Keywords: solution processed solar cells; polymer solar cells; spray coating; thin film characterization; spray-on solar cells solution processed solar cells; polymer solar cells; spray coating; thin film characterization; spray-on solar cells
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Eslamian, M.; Newton, J.E. Spray-on PEDOT:PSS and P3HT:PCBM Thin Films for Polymer Solar Cells. Coatings 2014, 4, 85-97.

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